Proof of Conjecture: n Not Prime => 2^n-1 Not Prime

[chimath35]

Conjecture: suppose n is an integer larger than 1 and n is not prime. Then 2^n-1 is not prime.

Proof attached.

Could someone please explain to me how they got to xy= 2^(ab)-1. I see the -1 part. Also I think I

do not understand the concept of 2^((a-1)b) I mean is it some index or some way of showing it is

finite? I am confused.

 

[chimath35]

The picture of the proof is showing up right?

 

[Tsunoyukami]

I do not see any picture of the proof attached viewing this on the mobile app on my iPad or when I go to web view.

 

[Mark44]

Conjecture: suppose n is an integer larger than 1 and n is not prime. Then 2^n-1 is not prime.

Proof attached.

Could someone please explain to me how they got to xy= 2^(ab)-1. I see the -1 part. Also I think I

do not understand the concept of 2^((a-1)b) I mean is it some index or some way of showing it is

finite? I am confused.

There is no attachment.

Please start a new thread using the homework template, and showing what you have done. I am closing this thread.